Table of Contents
- Introduction
- Understanding Different Types of Begonias
- Choosing the Perfect Location
- When to Plant Your Begonias
- How to Plant Begonia Tubers
- Watering and Feeding for Success
- Growing Begonias in Containers and Baskets
- Popular Begonia Varieties to Try
- Maintenance and Mid-Season Care
- Overwintering: Saving Your Tubers
- Simple Troubleshooting
- Conclusion
- FAQ
Introduction
Finding the perfect plant for a shady corner can be one of the most rewarding parts of gardening. While many flowers crave the direct heat of the midday sun, begonias thrive in the cooler, dappled light of trees and covered porches. These versatile plants offer a tropical feel with lush foliage and vibrant blooms that last from early summer right through the first frost. At Longfield Gardens, we enjoy how these plants transform quiet garden spaces into colorful retreats with very little effort.
This guide is designed for any gardener who wants to learn more about tuberous begonias and how to grow them successfully. Whether you are planting in window boxes, hanging baskets, or garden borders, the steps are straightforward and achievable. We will cover everything from selecting the right location to storing your tubers for the following year. Growing begonias is a simple way to bring professional-looking results to your home landscape.
Understanding Different Types of Begonias
Before you start planting, it is helpful to know which type of begonia you are growing. While there are thousands of species, most home gardeners choose from three main categories. Each has its own growth habit and preferred use in the yard.
Tuberous Begonias
These are the stars of the summer shade garden and are the primary focus for most bulb enthusiasts. Tuberous begonias grow from a thick, fleshy root called a tuber. They produce large, spectacular flowers that can look like roses, camellias, or carnations. You can find upright varieties that stand about 12 to 18 inches tall or trailing varieties that cascade beautifully over the edges of pots.
Wax Begonias (Fibrous-Rooted)
These are common bedding plants often found at local nurseries. They have smaller, succulent leaves and clusters of tiny red, white, or pink flowers. They are generally grown as annuals and have a fibrous root system rather than a tuber. While they are very dependable, they do not offer the same large-scale floral impact as tuberous varieties.
Rhizomatous and Rex Begonias
These types are primarily grown for their incredible foliage. Their leaves come in various shapes and patterns, often featuring swirls of silver, purple, and deep green. While they can grow outdoors in the summer, they are very popular as year-round houseplants. They prefer high humidity and indirect light.
Key Takeaway: For the biggest floral display in shade gardens and containers, choose tuberous begonias. They offer the widest variety of flower shapes and colors.
Choosing the Perfect Location
Success with begonias starts with finding the right spot. Since these are tropical plants, they have specific preferences for light, soil, and temperature. Matching these needs to your garden layout is the first "simple rule" for a healthy plant.
Light Requirements
Most begonias prefer partial shade or filtered sunlight. In many regions, the morning sun is gentle enough, but the intense afternoon sun can scorch their tender leaves. A spot under a tall tree canopy or on a north-facing porch is often ideal. If you notice the leaf edges turning brown and crispy, the plant may be getting too much direct light.
Soil and Drainage
"Drainage" refers to how quickly water moves through the soil. Begonias need moist soil, but they cannot sit in stagnant water. If the roots stay too wet, the tuber may rot. For garden beds, choose a spot where water does not puddle after a rain. If your soil is heavy clay, you can improve it by adding organic matter like compost or peat moss. For containers, always use a high-quality potting mix and ensure the pot has at least one drainage hole.
Air Circulation
While begonias love humidity, they also need fresh air. Good air circulation helps prevent common issues like powdery mildew, which looks like a dusting of white flour on the leaves. Space your plants according to the instructions on the package to ensure they have room to breathe as they grow.
When to Plant Your Begonias
Timing is everything when it comes to begonias. These plants are very sensitive to cold temperatures. Even a light frost can damage the foliage and stems.
Checking the Temperature
Do not move your begonias outside until the soil has warmed up and the danger of frost has completely passed. In most parts of the US, this is late May or early June. A good rule of thumb is to wait until overnight temperatures consistently stay above 60°F.
Starting Indoors for Earlier Blooms
Tuberous begonias can take several weeks to begin blooming after they are planted. Many gardeners choose to start their tubers indoors about 8 to 12 weeks before the last frost date. This gives the plants a head start. By the time the weather is warm enough to move them outside, they will already have established leaves and may even be ready to bloom.
What to Do Next: Timing Prep
- Find the average last frost date for your specific zip code.
- Count back 8 weeks from that date if you plan to start tubers indoors.
- Check your outdoor pots and garden beds to ensure they are clean and ready for planting.
- Monitor local weather forecasts for those steady 60°F nights.
How to Plant Begonia Tubers
Planting begonia tubers is a simple process, but there is one detail that matters more than any other: which side faces up. Once you get that right, the rest is easy.
Identifying the Top and Bottom
Take a close look at the tuber. One side will be slightly indented or hollow, resembling a small bowl. This is the top. This is where the sprouts will emerge. The rounded side is the bottom, where the roots will grow. If you truly cannot tell which side is which, you can plant the tuber on its side, and the plant will figure out the right direction.
Planting Depth and Spacing
In garden beds or containers, you only need to cover the tubers with a thin layer of soil.
- Depth: Plant the tuber so it is about 1/2 inch to 1 inch below the soil surface.
- Spacing: If you are planting in the ground, space them about 8 to 12 inches apart. In a container, you can plant them slightly closer together for a fuller look. A 12-inch pot can comfortably hold two or three tubers.
Initial Watering
After planting, water the soil lightly. You want the soil to be damp to help the tuber "wake up" and start growing roots. Avoid soaking the soil completely at this stage. Since there are no leaves yet to pull moisture out of the ground, the tuber can easily become too wet if overwatered early on.
Key Takeaway: Plant begonia tubers with the hollow side facing up. Cover them with only about half an inch of soil for the best results.
Watering and Feeding for Success
Once your begonias have sprouted and are growing actively, they need regular care to keep the blooms coming. They are not high-maintenance plants, but they do appreciate consistency.
The Right Way to Water
We recommend the "deep then dry" method. Water the plants thoroughly until water runs out of the bottom of the pot or the soil is moist several inches deep. Then, wait until the top inch of soil feels dry to the touch before watering again.
When you water, try to aim for the base of the plant rather than splashing the leaves. Keeping the foliage dry helps prevent spotting and fungal diseases. Early morning is the best time to water, as it allows any moisture on the leaves to evaporate during the day.
Fertilizing Your Plants
Begonias are heavy feeders because they put so much energy into producing large flowers. You can start fertilizing once the plant has several sets of leaves. Use a balanced, water-soluble fertilizer once every two weeks. Some gardeners prefer a "bloom booster" formula with higher phosphorus to encourage more flowers. Always follow the instructions on the product label for the correct dosage.
Growing Begonias in Containers and Baskets
Containers are perhaps the most popular way to grow begonias. They allow you to move the color exactly where you need it, such as a shaded doorstep or a patio table.
Choosing the Right Pot
Plastic, ceramic, or terra cotta pots all work well. Just remember that terra cotta is porous and dries out faster than plastic. If you use a hanging basket, consider using a coco-fiber liner to help hold moisture while still allowing for excellent drainage.
Trailing vs. Upright Varieties
When designing a container, think about the growth habit of the variety you chose.
- Upright Varieties: These work best in the center of a pot or in window boxes. Varieties like the Amerihybrid Roseform have sturdy stems that hold large, rose-like flowers upright.
- Trailing Varieties: These are bred to cascade. Their stems naturally grow outward and downward. Our Cascading Hanging Basket begonias are perfect for elevated pots where the flowers can hang down at eye level.
Potting Mix Tips
Never use "garden soil" or "topsoil" in a container. It is too heavy and will pack down, suffocation the roots. Instead, use a lightweight potting mix that contains peat moss, perlite, or vermiculite. These ingredients keep the soil airy and help it hold just the right amount of moisture.
Popular Begonia Varieties to Try
At Longfield Gardens, we offer a wide range of begonia varieties, each with a unique look. Choosing a few different types can add texture and interest to your shade garden.
Roseform and Ruffled
These varieties are prized for their massive blooms. A single flower can be 4 to 6 inches across. As the name suggests, the petals are arranged in a tight, symmetrical pattern that looks exactly like a formal rose. Ruffled varieties have edges that are crinkled or fringed, adding even more volume to the flower.
Picotee Begonias
Picotee varieties feature two-tone flowers. The petals are one color (like white or yellow) with a thin, contrasting edge in a different color (like red or pink). These are very elegant and draw the eye when planted in groups.
Scentiment Begonias
Most begonias do not have a strong fragrance, but the Scentiment series is an exception. These varieties have been bred to produce a lovely, delicate scent. They are best planted in pots on a patio or near a window where you can enjoy the aroma as you pass by.
Boutique and On Top
These are slightly more compact varieties. They are excellent for smaller pots or as "fillers" in a mixed container. They tend to produce a high volume of smaller flowers rather than a few massive ones, providing a constant blanket of color.
Maintenance and Mid-Season Care
To keep your begonias looking their best through the dog days of summer, a little bit of grooming goes a long way. This is not a difficult chore, but it keeps the plants tidy and healthy.
Deadheading
Deadheading is the process of removing flowers that have finished blooming. When a begonia flower begins to wilt or turn brown, you can simply pinch it off at the stem. This prevents the plant from putting energy into producing seeds and encourages it to grow more flowers instead. Some modern varieties are "self-cleaning," meaning the old flowers fall off on their own, but a quick check once a week is still a good idea.
Supporting Tall Stems
Upright tuberous begonias can sometimes become "top-heavy" because their flowers are so large. If you notice a stem starting to lean, you can use a small bamboo stake and a piece of soft garden twine to gently support it. Be careful not to pierce the tuber when you push the stake into the soil.
Dealing with Heat Stress
In the middle of a very hot summer, begonias may slow down their blooming. This is a natural reaction to high temperatures. If your plants look a bit tired, ensure they are getting enough water and perhaps move container plants to an even shadier spot until the heat wave passes. They will usually bounce back once the weather cools slightly.
Overwintering: Saving Your Tubers
One of the best things about tuberous begonias is that they can be saved and replanted year after year. Since they are not hardy in most of the US, you will need to "overwinter" them indoors.
Lifting the Tubers
When the weather begins to cool in autumn, the leaves will naturally start to yellow. This is a signal that the plant is entering dormancy. After the first light frost kills the top growth, or if a hard frost is predicted, it is time to bring them in.
- Cut the stems back to about 1 inch above the tuber.
- Gently lift the tubers out of the soil using a garden fork or your hands.
- Shake off the excess dirt, but you do not need to wash them.
Curing and Storage
Place the tubers in a warm, dry, and shady spot for about a week to "cure." This helps the outer skin toughen up. Once they are dry, place them in a cardboard box or a paper bag. We recommend nesting them in dry peat moss, sawdust, or shredded paper to keep them from touching each other.
Store the box in a cool, dark, and dry place where temperatures stay between 40°F and 50°F. A basement or an attached garage that does not freeze is usually perfect. In the spring, you can pull them out and start the process all over again.
Key Takeaway: Saving begonia tubers is an easy way to grow your garden collection over time. Just keep them dry, cool, and frost-free during the winter months.
Simple Troubleshooting
If your begonias aren't performing as expected, the solution is usually found in one of the basics: light, water, or air. Most issues are easy to fix if you catch them early.
Why Are the Leaves Dropping?
If a healthy-looking plant suddenly drops its leaves or unopened flower buds, it is usually a sign of stress. This often happens if the soil has been allowed to dry out completely or if the plant is sitting in a drafty area. Check the soil moisture and ensure the plant is protected from strong winds.
What if the Plant Is Leggy?
"Leggy" means the stems are very long and thin with few leaves. This is almost always caused by a lack of light. The plant is stretching out to try and find more sun. Move the plant to a spot that receives brighter, indirect light or a little bit of morning sun.
Preventing Mold and Rot
If you see white fuzzy spots on the leaves (powdery mildew) or if the base of the stem feels soft and mushy, the plant is likely too wet or lacks airflow.
- Reduce your watering frequency.
- Make sure there is space between your pots.
- Avoid getting water on the leaves when you water.
What to Do Next: Mid-Season Check
- Check for spent blooms and pinch them off once a week.
- Feel the soil daily during heat waves to ensure it stays moist.
- Look at the leaf color; dark green means the plant is happy with its light levels.
- Apply a liquid fertilizer every twond week to keep the energy levels high.
Conclusion
Begonias are a classic choice for a reason. They provide a level of color and elegance that few other shade-loving plants can match. By following the simple rules of right plant, right place, you can enjoy a tropical oasis right on your porch or under your favorite backyard tree. Whether you choose the massive Roseform blooms or the graceful trails of a cascading variety, these plants are sure to become a highlight of your summer garden.
We hope this guide has given you the confidence to bring begonias into your landscape this season. At Longfield Gardens, we take pride in providing the high-quality tubers and practical advice you need to succeed. Gardening should be a relaxing and rewarding part of your life, and begonias are the perfect partner for that journey.
- Choose the right variety for your space (upright vs. trailing).
- Wait for warm weather before planting outside.
- Keep the soil moist but never soggy.
- Save your tubers in the fall to enjoy them again next year.
"There is a unique joy in seeing a shady corner of the yard come to life with the brilliant, rose-like blooms of a begonia. It proves that you don't need a full-sun field to have a spectacular flower garden."
FAQ
Can begonias grow in full sun?
Most begonias prefer shade or partial shade, as the hot afternoon sun can easily burn their leaves. However, some newer varieties with bronze foliage are bred to handle more sunlight. Always check the specific light requirements on the tag of the variety you are planting. For more light guidance, see Longfield Gardens' begonia sun-or-shade guide.
Which way is up when planting a begonia tuber?
The "top" of the begonia tuber is the side with a slight hollow or indentation, similar to a shallow bowl. This is where the new sprouts will emerge. The rounded, smooth side should face downward into the soil.
How often should I water my begonias?
You should water begonias when the top inch of soil feels dry to the touch. They like to stay moist but will suffer if the soil is constantly saturated. Container-grown begonias may need water daily during the hottest parts of the summer. If you are timing your order, Longfield Gardens' shipping information explains the zone-based schedule.
Do begonias come back every year?
In warm climates (USDA zones 9 to 11), begonias can stay in the ground year-round. In colder regions, they are treated as annuals or the tubers must be dug up in the fall and stored in a cool, dry place indoors to be replanted the following spring. For product quality and support, see Longfield Gardens' 100% Quality Guarantee.